6x^2+7x-2
    3=-2×2/3+b
    x^2-40x+396=0
    4200=（15-x）（400+4x）
    x^3+4x^2+7x+16 = 0
    3/(√(3+x^2)*2*√(1+3/4/x^2))=√7/7
    x^3+4x^2+7x+8 = 0
    x^3+4x^2+7x+2.4 = 0
    x^3+4x^2+7x+400 = 0
    x^3+4x^2+7x＝0
    4181.4646469t^6-0.272t^2-0.15790=0
    x²-2x-2024=0
    x²-2x-224=0
    (0.983/0.0048)t^3+12.29t^2-1.97=0
    6+x^2+x*2*sqrt(5)*(sqrt(5)-5)/10=3
    -7x^2+12 x+1
    2x²-25x+50=0
    5.49-11445t^3-33.05t=0
    13/14x-x=-8
    x^64=2^(x+64)

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